扩张腔腔体长度越大、进出口管管径越小，扩张腔消声器的压力损失越大。
The longer the expand length is, the smaller the inlet diameter is, the greater the pressure loss of expand muffler element is.
通过改变消声器的两腔容积比，可以改善消声器的有效消声频率范围。
Changing volume ratio of the two-chamber muffler can improve the effective noise reduction frequency range of the muffler.
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